Use the SEGMENT operand to specify the number of pages (in an output segment) that the system should write to the system output data set before spinoff processing. Issue the ALLOCATE command and specify the FILE operand, the SYSOUT operand, and the SEGMENT operand followed by the number of pages in parentheses. This specifies how many pages the system will write to the system output data set before spinoff processing.

To specify that the system write a 200-page segment to the system output data set (SYSPRT), enter:

ALLOCATE FILE(sysprt) SYSOUT SEGMENT(200)

For more information about these and other system output operands, see the ALLOCATE command in z/OS TSO/E Command Reference.